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Son of Domhnall Óg O'Donnell, 5th Chieftain and Joan MacSweeney Husband of Joan Gallagher Father of Niall Garbh O'Donnell, 9th Chieftain; Conchubhar O'Donnell, 8th Chieftain and Felim O'Donnell, 11th Chieftain Brother of Toirrdhelbhach O'Donnell, 6th Chieftain (Usurper)